EP1189377A1 - Vorrichtung zur Wellenlängenselektion und -Wandlung, und damit hergestellter optische Schaltmatrix - Google Patents

Vorrichtung zur Wellenlängenselektion und -Wandlung, und damit hergestellter optische Schaltmatrix Download PDF

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Publication number
EP1189377A1
EP1189377A1 EP01402308A EP01402308A EP1189377A1 EP 1189377 A1 EP1189377 A1 EP 1189377A1 EP 01402308 A EP01402308 A EP 01402308A EP 01402308 A EP01402308 A EP 01402308A EP 1189377 A1 EP1189377 A1 EP 1189377A1
Authority
EP
European Patent Office
Prior art keywords
wavelength
signal
spectral
oan
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01402308A
Other languages
English (en)
French (fr)
Inventor
Dominique Chiaroni
Nicolas Le Sauze
Alain Pons
Roland Mestric
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP1189377A1 publication Critical patent/EP1189377A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0011—Construction using wavelength conversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0013—Construction using gating amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0015—Construction using splitting combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/002—Construction using optical delay lines or optical buffers or optical recirculation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0007—Construction
    • H04Q2011/0024—Construction using space switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0037—Operation
    • H04Q2011/0039—Electrical control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0052—Interconnection of switches
    • H04Q2011/0058—Crossbar; Matrix

Definitions

  • the invention relates to the field of optical transmission and more precisely that of switching devices for organized optical signals in packets and multiplexed in wavelengths.
  • switched networks optical packages have nodes with devices fast packet switching for group routing variable or fixed size data, usually called “packets” or “cells” depending on whether it is respectively an Internet type network or a network ATM.
  • Photonic switching matrices are "all optical" type switching devices where the data, usually in the form of modulation amplitude of an optical carrier wave, are pointed from one optical link to another while retaining their nature optical, that is to say without going through a conversion in the electrical field.
  • One of the functions of these matrices is synchronize the packets, in order to manage conflicts so as to minimize losses of packets. If we use wavelength multiplexing, hereinafter referred to as WDM (from the English “Wavelength Division Multiplexing "), the matrices must also be provided for take into account the spectral dimension of the signals to switch.
  • WDM wavelength multiplexing
  • the invention relates to a device for selecting and wavelength conversion usable in these matrices for managing wavelength multiplexing.
  • the invention also relates to a matrix of photonic switching incorporating this device.
  • Figure 1 shows an example of a switch optics where the invention can be applied.
  • the switch basically consists of a photonic switching matrix 1 and one unit associated control electronics 2.
  • the matrix 1 which receives several WDM optical signals input We, We ' is composed of several modules 3, 3'. For reasons of clarity, two modules and two WDM signals only are shown.
  • the signals We, We ' each consisting of several spectral channels ⁇ 1- ⁇ n, are respectively coupled with leaves to modules 3, 3 'via lines to adjustable delay DL, DL ', and secondly to interfaces of optical-electrical conversion OE, OE 'of the control 2 via demultiplexers De, De '.
  • the switching matrix 1 comprises, coupled in waterfall, sets of delay lines 5 belonging each one of the modules 3, 3 ', a space switch 6 of common "cross-bar" type, spectral selection stages 7, spectral reallocation stages 8 and stages of output coupling 4 each belonging to one of the modules.
  • the electronic control unit 2 comprises a unit 9 connected on the one hand to the interfaces outputs of optical-electrical conversion OE, OE 'and on the other hand to a control circuit 10.
  • the processing unit 9 firstly has the function of decode the different headers of the received packets in order to extract the respective destinations. Based on these destination information produced by imposed choices by a routing table, the unit 9 then detects the possible conflicts. So, for each package received carried by each wavelength, unit 9 determines to which port output from the matrix and when the packet should be directed. This routing information is transmitted to the control circuit 10 which then sends signals from control suitable for space switch 6 and floors spectral selection 7.
  • FIG. 2 shows in more detail one of the modules 3 of the matrix 1.
  • the set 5 is essentially made up of k delay lines L1, Lu, Lk of different lengths and each sized to create an entire multiple delay the transmission time of a packet.
  • Each delay line receives the input multiplex We associated with the module, by through a diffuser coupler 11.
  • the outputs of the k delay lines are coupled respectively at k inputs of the common space switch 6.
  • the spectral selection stage 7 is composed of n wavelength selectors SEL1, SEL2, SELj, SELn controlled respectively by control signals CC1, CC2, CCj, CCn from the control circuit 10.
  • the inputs of the n selectors are coupled respectively at n outputs of the space switch 6 providing the signals S1, S2, Sj, Sn.
  • the outputs of selectors SEL1, SEL2, SELj, SELn are linked respectively with n inputs of a multiplexer 4 by via C ⁇ 1 wavelength converters, C ⁇ 2, C ⁇ j, C ⁇ n constituting the spectral reallocation stage 8.
  • each packet belonging to a multiplex any input and carried by a wavelength any may experience a selected delay, be referred to any output from the matrix and be output by a new wavelength.
  • each signal Sj from of an output of switch 6 is processed by a device wavelength selection and conversion SELj, C ⁇ j one of the modules 3 before being injected into the multiplexer 4 of this module
  • each selector SELj consists in extracting from the WDM Sj signal received from switch 6 a signal carried by only one of the lengths waves assigned to the spectral channels of the WDM signal.
  • the wavelength converters C ⁇ 1-C ⁇ n of the same module 3 have the function of carrying the signals thus extracted by new wavelengths ⁇ 1- ⁇ n fixed and different from each other so that we can be again combined by means of multiplexer 4 to constitute a WDM output signal Ws.
  • FIG. 3 represents a known embodiment of a wavelength selection and conversion device SELj, C ⁇ j associated with one of the outputs of switch 6.
  • the SELj selection device includes a coupler Diffuser type Ce with one input and n outputs which are respectively coupled to n inputs of a multiplexer MX via n optical doors OG1, OG2, OGx, OGn electrically controlled by CCj signals.
  • the exit of the MX multiplexer is coupled to the input of the converter wavelength C ⁇ j.
  • the Ce coupler receives the signal WDM Sj and the optical gates receive signals CCj control elements such as only one of the doors, for example OGx, be busy.
  • the MX multiplexer which is coupled to the gate OGx receives the signal Sj and, taking into account the filtering function of the multiplexers, only the wavelength, for example ⁇ x, which is in agreement with this input is passed to the output of the multiplexer MX.
  • the multiplexer then supplies the converter C ⁇ j with a signal S ⁇ x which belongs to the spectral channel carried by the wavelength ⁇ x.
  • the converter C ⁇ j delivers the converted signal S ⁇ j carried by the imposed wavelength ⁇ j through this converter.
  • wavelength converters are made using semiconductor optical amplifiers operating in cross gain modulation mode, or at by means of interferometric structures, for example of the type Mach-Zehnder, exploiting cross-phase modulation. These devices have a certain bandwidth spectral, that is, they are able to convert correctly optical signals whose carrier has a wavelength included in this bandwidth.
  • the possible spectral bandwidth of converters is linked in practice to the frequency of signal modulating the carriers, therefore at the data rate at pass. More specifically, for a type of converter given, if you want to increase the flow, you have to size the optical components which constitute it so as to increase their speed, so that of the converter, but a sizing in this direction leads to a reduction in its spectral bandwidth. For example, for a flow of 10 Gbit / s, a converter based on a low factor semiconductor optical amplifier confinement and ensuring a bandwidth greater than 40 nm. To reach a speed of 40 Gbit / s, you need increase the confinement factor of the amplifier used and / or the length of its active area, but the width tape is reduced, which may be insufficient for WDM broad spectrum applications.
  • One solution to this problem may be to design more sophisticated converters, for example using a cascade of semiconductor optical amplifiers. This solution would increase the flow while maintaining bandwidth, but at a limited cost additional.
  • each wavelength converter includes a semiconductor optical amplifier used as a door optical and receiving on the one hand one of said extracted signals and on the other hand a probe wave having said length wave, said converted signal being said wave probe amplified by said amplifier with gain function of the optical power of said extracted signal which it receives.
  • each amplifier is dimensioned to present maximum gain at the wavelength of the extracted signal it receives.
  • the invention also relates to a matrix of photonic switching comprising the device according to the invention.
  • the system for selecting and converting wavelength represented by the block diagram of the Figure 4 includes a DMX demultiplexer with an A input and of n outputs B ⁇ 1-B ⁇ n coupled respectively to n inputs corresponding A1-An of a coupler Cs via n optical doors OG1-OGn followed by converters corresponding wavelength C1 ⁇ j -Cn ⁇ j. Each converter is provided to provide a converted signal carried by the same wavelength ⁇ j.
  • input A receives the signal WDM Sj and the outputs B ⁇ 1-B ⁇ n respectively supply n signals S ⁇ 1-S ⁇ n extracted from the received signal Sj and corresponding to n spectral channels ⁇ 1- ⁇ n of the WDM signal.
  • Optical doors OG1-OGn also receive control signals CCj, such that only one of the doors is passable. For example in applying the control signal Cjx to the gate OGx only, the converter associated with this door provides only a converted signal depending on the extracted signal corresponding S ⁇ x.
  • an F ⁇ j optical filter calibrated on the wavelength ⁇ j can be coupled to the output B of the coupler Cs.
  • Figures 5 and 6 show two variants of based on semiconductor optical amplifiers OA1-OAn used both as optical doors and as wavelength converters.
  • optical amplifiers semiconductors operate in modulation regime gain cross and each receive one of signals extracted S ⁇ 1-S ⁇ n by the DMX demultiplexer and on the other hand, a probe wave P ⁇ j of wavelength ⁇ j, supplied by a common LD laser source.
  • the probe wave P ⁇ j and the extracted signal S ⁇ 1-S ⁇ n injected into each amplifier here have meanings of opposite spread. Although not essential, this provision limits the filtering constraints at the outlet of the Cs coupler.
  • the optical gate function of the amplifiers by acting on their supply voltages.
  • the probe wave could be mixed with the input signal Sj to provided that the DMX demultiplexer is provided to be able to extract it by an exit provided for this purpose.
  • the optical gate function of the amplifiers by a selective injection of the P ⁇ j probe wave into only one of the amplifiers.
  • the LD laser source is coupled to amplifiers through optical gates controlled.
  • each amplifier will be sized to present a maximum gain at the wavelength of the extracted signal it receives. This can be obtained in a manner well known to the manufacturers of optical components by an appropriate choice of composition the active layer of each amplifier and its geometry.
  • the photonic switching matrix 1 includes one or more set (s) 5 of delay lines, a space switch 6, one or more stages of spectral selection 7 and one or more stages of spectral reallocation 8.
  • the stages of spectral selection 7 and spectral reallocation 8 include devices for selection and conversion of wavelength as described with reference to Figures 4 to 6.
EP01402308A 2000-09-18 2001-09-06 Vorrichtung zur Wellenlängenselektion und -Wandlung, und damit hergestellter optische Schaltmatrix Withdrawn EP1189377A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0011888 2000-09-18
FR0011888A FR2814305B1 (fr) 2000-09-18 2000-09-18 Dispositif de selection et de conversion de longueur d'onde, et matrice de commutation photonique l'incorporant

Publications (1)

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EP1189377A1 true EP1189377A1 (de) 2002-03-20

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EP01402308A Withdrawn EP1189377A1 (de) 2000-09-18 2001-09-06 Vorrichtung zur Wellenlängenselektion und -Wandlung, und damit hergestellter optische Schaltmatrix

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US (1) US6657773B2 (de)
EP (1) EP1189377A1 (de)
JP (1) JP2002171541A (de)
FR (1) FR2814305B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2816778B1 (fr) * 2000-11-13 2003-02-07 Cit Alcatel Dispositif de selection et de conversion longueur d'onde, et matrice de commutation photonique l'incorporant
JP2002296629A (ja) * 2001-03-30 2002-10-09 Furukawa Electric Co Ltd:The ４光波混合を用い雑音を考慮した波長変換方法と波長変換器および光源
US6891995B2 (en) * 2002-03-01 2005-05-10 Matsushita Electric Industrial Co., Ltd. Wavelength division multiplex transmission system
JP4657785B2 (ja) * 2005-04-14 2011-03-23 株式会社日立製作所 光スイッチおよびその光経路制御方法
US7231109B1 (en) * 2006-05-28 2007-06-12 Alan Huang Ultrafast optical communications system with multiplexer and demultiplexer
JP6249403B2 (ja) * 2014-02-27 2017-12-20 国立研究開発法人情報通信研究機構 光遅延線及び電子バッファ融合型光パケットバッファ制御装置
WO2017138550A1 (ja) * 2016-02-12 2017-08-17 日本電気株式会社 光ネットワーク制御装置および光パス設定方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0310058A2 (de) * 1987-09-30 1989-04-05 Nec Corporation Zeit- und Wellenlängenmultiplex-Vermittlungssystem
US5612805A (en) * 1994-06-07 1997-03-18 Alcatel Cit Add-drop optical spectrum-division multiplexer
US5896212A (en) * 1995-07-12 1999-04-20 Alcatel N.V. Wavelength division multiplexing optical communication network
US5953142A (en) * 1996-10-07 1999-09-14 Alcatel Variable delay apparatus for optical signals

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6778318B2 (en) * 2001-06-29 2004-08-17 Hrl Laboratories, Llc Optical-to-wireless WDM converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0310058A2 (de) * 1987-09-30 1989-04-05 Nec Corporation Zeit- und Wellenlängenmultiplex-Vermittlungssystem
US5612805A (en) * 1994-06-07 1997-03-18 Alcatel Cit Add-drop optical spectrum-division multiplexer
US5896212A (en) * 1995-07-12 1999-04-20 Alcatel N.V. Wavelength division multiplexing optical communication network
US5953142A (en) * 1996-10-07 1999-09-14 Alcatel Variable delay apparatus for optical signals

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FR2814305B1 (fr) 2002-12-06
JP2002171541A (ja) 2002-06-14
FR2814305A1 (fr) 2002-03-22
US6657773B2 (en) 2003-12-02
US20020033994A1 (en) 2002-03-21

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